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박설현,윤정환,서동표,정대훈,오율권 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.1
Polymer drag reduction can offer a attractive way to utilize ready-made facilities in crude-oil transport system without additional large expenditure. Also, drag reduction in two phase flow can be applied to phase change system such as chemical reactor, pool and pump impeller which occurs cavitation. But the research on drag reduction in two phase flow has not been investigated. Therefore, experimental investigations have been carried out to analyze the drag reduction in the single phase and two phase flow. The objectives of the proposed investigation are primarily to identify and develop high performance polymer additives for fluid transportation. And drag reduction will be evaluated in horizontal flow by measuring void fraction, pressure drop, mean liquid velocity and turbulent intensity
박설현,정대훈,오율권 조선대학교 에너지.자원신기술연구소 2001 에너지·자원신기술연구소 논문지 Vol.23 No.1
Solid-liquid phase change (i.e. melting or solidification) occurs in a number of situations of practical interest. Some common examples include the melting of edible oil. metallurgical process such as casting and welding, and materials science applications such as crystal growth. Therefore, due to the practical importance of the subject, there have been a large number of experimental and numerical studies of problems involving phase change during the past few decades. This study presents experimental work on phase change heat transfer. Especially, in order to increase heat transfer rate. ultrasonic vibrations were introduced. The melting cavity contained one vertical heating surface which dissipates heat at constant power and was insulated on the sides. Experimental observations show that the effect of ultrasonic vibrations on heat transfer is very important throughout melting process. The results of this study reveal that ultrasonic vibrations accompany the effects like agitation, acoustic streaming, cavitation, and oscillating fluid motion. Such effects are a prime mechanism in the overall melting process when ultrasonic vibrations are applied. They speed up the melting process as much as 2.5 times, compared with the result of natural melting. Also, energy can be saved by applying ultrasonic vibrations to the natural melting.
가스가 주입된 용기에서 기공율, 기포빈도와 온도측정에 관한 연구
박설현,오율권,서동표 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.2
The local phase volume fraction, bubble frequency and the phase temperature distributions were measured in vertical air injected water baths. An electroresistivity probe was employed for the determination of the local void fraction and bubble arrival frequency. The phase resolved temperatures were measured using a microthermocouple. The thermocouple signals were digitally filtered, and were carried out to characterize the overall structure of the gas-liquid plume and the heat transfer mechanism between the phases.
김보람,김호영,손유라,오진주,윤슬기,이효정,장문영 대한감각통합치료학회 2011 대한감각통합치료학회지 Vol.9 No.1
목적 : 초등학교 고학년 학생의 장애아동에 대한 인식을 알아보는 것이다. 연구방법 : 연구 대상은 김해시에 소재한 통합교육을 실시하지 않는 초등학교의 4, 5, 6학년의 비장애 아동이었다. 연구 기간은 2008년 10월 2일부터 10월 17일까지였으며, 설문지를 사용하였다. 설문지의 하위 영역은 사귐, 활 동, 학업 영역의 세 부분으로 각 10문항으로 이루어져 있으며 SPSS 12.0을 사용하여 분석하였다. 결과 : 장애아동에 대한 인식조사 결과 첫째, 성별에 따른 인식은 남학생보다 여학생의 평균 점수가 높았으나 통계 적으로 유의미한 차이는 없었다. 둘째, 학년에 따른 인식은 4학년의 평균 점수가 가장 높았고 6학년이 가장 낮았으 며 통계적으로 유의미한 차이가 있었다(F=3.546, p<0.05). 셋째, 장애인 접촉 유무에 따른 인식은 접촉 경험이 없 는 학생이 있는 학생보다 평균점수가 높았으나 통계적으로 유의미한 차이는 없었다. 결론 : 비장애학생의 장애아동에 대한 인식은 학년에 따라 차이가 있었다. 본 연구는 작업치료사들에게 장애아동에 대한 또래집단의 인식에 대한 정보를 제공함으로써 학교환경에 대한 이해를 도울 수 있을 것이다. Objective : The purpose of this study was to investigate attitude of grade-schoolers toward children with disabilities. Methods : The subjects of this study were grade-schoolers who have not received an inclusive education in Gim-hae. The study was surveyed from October second to 17th in 2008. The survey was categorized into three parts; comradeship, activity, and study. Each part of the survey consists of 10 questions. Data were analyzed by SPSS (version 12.0). Results : The results were as follows; First, the attitude of girls toward disabled students was non-significant compared to boys. Second, the order of attitude degree in grade of students was 4, 6, and 5. The attitude toward children with disabilities showed statistically significant difference according to grade(F=3.546, p<0.05). Third, the attitude of students who have experience of contact with people with disabilities was non-significant compared to non-experienced students. Conclusion : In conclusion, therefore peer groups in lower class levels showed more positive attitude toward the children with disabilities. The result will be useful information for understanding disabled children and making positive attitude. Also it is expected that occupational therapists help disabled children to participate in school life successfully using these information.
Oh, Hye‐,Jin,Kim, Sae‐,Um,Song, Ji‐,Won,Lee, Jung‐,Hoo,Kang, Woo‐,Ri,Jo, Ye‐,Seul,Kim, Kyoung‐,Rok,Bornscheuer, Uwe T.,Oh, Deok‐,Kun,Park, Jin‐,By WILEY-VCH 2015 Advanced Synthesis & Catalysis Vol. No.
<P><B>Abstract</B></P><P>Hydroxy fatty acids are used as starting materials for the production of secondary metabolites and signalling molecules as well as in the manufacture of industrial fine chemicals. However, these compounds are usually difficult to produce from renewable biomass by chemical means. In this study, linoleate double bond hydratases of <I>Lactobacillus acidophilus</I> NBRC 13951 were cloned for the first time. These enzymes were highly specific for the hydration of the C‐9 or the C‐12 double bond of unsaturated fatty acids (e.g., linoleic acid). Thereby, the enzymes allowed the selective production of hydroxy fatty acids such as 13‐hydroxy‐<I>cis</I>‐9‐octadecenoic acid and 10‐hydroxy‐<I>cis</I>‐12‐octadecenoic acid from linoleic acid. In addition, the hydroxy fatty acids were further converted into industrially relevant carboxylic acids (e.g., 12‐hydroxy‐<I>cis</I>‐9‐dodecenoic acid, α,ω‐tridec‐9‐enedioic acid) and lactones (i.e., δ‐decalactone, γ‐dodecelactone) <I>via</I> whole‐cell biocatalysis using an enzyme cascade. This study thus contributes to the preparation of hydroxy fatty acids, unsaturated carboxylic acids, and lactones from renewable unsaturated fatty acids.</P>
Zn<sub>2</sub>SnO<sub>4</sub>-Based Photoelectrodes for Organolead Halide Perovskite Solar Cells
Oh, Lee Seul,Kim, Dong Hoe,Lee, Jin Ah,Shin, Seong Sik,Lee, Jin-Wook,Park, Ik Jae,Ko, Min Jae,Park, Nam-Gyu,Pyo, Sung Gyu,Hong, Kug Sun,Kim, Jin Young American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.40
<P>We report a new ternary Zn<SUB>2</SUB>SnO<SUB>4</SUB> (ZSO) electron-transporting electrode of a CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> perovskite solar cell as an alternative to the conventional TiO<SUB>2</SUB> electrode. The ZSO-based perovskite solar cells have been prepared following a conventional procedure known as a sequential (or two-step) process with ZSO compact/mesoscopic layers instead of the conventional TiO<SUB>2</SUB> counterparts, and their solar cell properties have been investigated as a function of the thickness of either the ZSO compact layer or the ZSO mesoscopic layer. The presence of the ZSO compact layer has a negligible influence on the transmittance of the incident light regardless of its thickness, whereas the thickest compact layer blocks the back-electron transfer most efficiently. The open-circuit voltage and fill factor increase with the increasing thickness of the mesoscopic ZSO layer, whereas the short-circuit current density decreases with the increasing thickness except for the thinnest one (∼100 nm). As a result, the device with a 300 nm-thick mesoscopic ZSO layer shows the highest conversion efficiency of 7%. In addition, time-resolved and frequency-resolved measurements reveal that the ZSO-based perovskite solar cell exhibits faster electron transport (∼10 times) and superior charge-collection capability compared to the TiO<SUB>2</SUB>-based counterpart with similar thickness and conversion efficiency.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-40/jp509183k/production/images/medium/jp-2014-09183k_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp509183k'>ACS Electronic Supporting Info</A></P>